Monitor calibration
Monitor calibration aligns your screen with a known standard, so the colors and brightness you see are actually correct. Without calibration you grade on a distorted image and your film looks different to others. It's the foundation for reliable color work.
You calibrate with a measuring device (a colorimeter) that reads your screen and corrects it toward, say, the Rec.709 standard. Do this regularly, because screens drift in brightness and color over time. For serious grade work in DaVinci Resolve you ideally work on a separate, calibrated monitor rather than your laptop screen. Tip: watch your ambient light too, because bright or colored light in your room affects how you judge the image.
Prefer a look in one click?
The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.